393215 has 4 divisors (see below), whose sum is σ = 471864. Its totient is φ = 314568.

The previous prime is 393209. The next prime is 393241. The reversal of 393215 is 512393.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 393215 - 2¹⁸ = 131071 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 4, base 8 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39317 + ... + 39326.

It is an arithmetic number, because the mean of its divisors is an integer number (117966).

393215 is a Friedman number, since it can be written as (9+3)*(2^3)^5-1, using all its digits and the basic arithmetic operations.

2³⁹³²¹⁵ is an apocalyptic number.

393215 is a deficient number, since it is larger than the sum of its proper divisors (78649).

393215 is an equidigital number, since it uses as much as digits as its factorization.

393215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78648.

The product of its digits is 810, while the sum is 23.

The square root of 393215 is about 627.0685767920. The cubic root of 393215 is about 73.2616494186.

The spelling of 393215 in words is "three hundred ninety-three thousand, two hundred fifteen".